问题
I have created excel workbook using .NET interop. The excel workbook is created successfully through my C# code. When the user makes any changes in the excel, I want to do some stuff. I have used the ExcelWorkSheet.Change
event. But this event is not firing. Here is my code-
using Excel = Microsoft.Office.Interop.Excel;
public class xxx
{
static Excel.Application xlApp;
static Excel.Workbook xlWorkBook;
static Excel.Worksheet xlWorkSheet;
static Excel.Worksheet xlWorkSheet1;
static Excel.DocEvents_ChangeEventHandler EventDel_CellsChange;
public static void ExportToExcel()
{
xlApp = new Excel.ApplicationClass();
object misValue = System.Reflection.Missing.Value;
xlWorkBook = xlApp.Workbooks.Add(misValue);
xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);
xlWorkSheet1 = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(2);
---------------- data is dumped to the excel here----------------
((Microsoft.Office.Interop.Excel._Worksheet)xlWorkSheet).Activate();
xlApp.EnableEvents = true;
EventDel_CellsChange = new Excel.DocEvents_ChangeEventHandler(Worksheet_Change);
xlWorkSheet.Change += EventDel_CellsChange;
xlWorkBook.SaveAs("D:\\Test.xlsx", Excel.XlFileFormat.xlWorkbookDefault, misValue, misValue, misValue, misValue, Excel.XlSaveAsAccessMode.xlShared, misValue, misValue, misValue, misValue, misValue);
xlWorkBook.Close(true, misValue, misValue);
xlApp.Quit();
releaseObject(xlWorkSheet1);
releaseObject(xlWorkSheet);
releaseObject(xlWorkBook);
releaseObject(xlApp);
System.Web.HttpResponse response = System.Web.HttpContext.Current.Response;
response.ClearContent();
response.Clear();
response.ContentType = "application/vnd.ms-excel";
response.AddHeader("Content-Disposition", "attachment; filename=Test.xlsx;");
response.TransmitFile(("D:\\Test.xlsx");
response.Flush();
response.End();
}
public static void Worksheet_Change(Excel.Range Target)
{
try
{
xlApp.EnableEvents = false;
Excel.Range range = xlWorkSheet.get_Range("Y2");
range.Formula = "=A2";
}
catch (Exception ex)
{
}
finally
{
xlApp.EnableEvents = true;
}
}
}
No change is reflected in the Excel file when the user makes some changes. Please help me out. Thanks in advance
回答1:
The Worksheet_Change event is not global - it only applies to that particular worksheet. In your code you wire up the event handler to the xlSheet1.Change event, then close the workbook and release all the Excel objects.
EDIT: I popped your code behind a Form and adapted it slightly. I could get the event to fire and the formula in cell Y2 is set. I'm not 100% sure of your circumstances, but try this code and then compare with your own. Hope it helps.
public partial class Form1 : Form
{
private static Excel.Application xlApp;
private static Excel.Workbook xlWorkBook;
private static Excel.Worksheet xlWorkSheet;
private static Excel.Worksheet xlWorkSheet1;
private static Excel.DocEvents_ChangeEventHandler EventDel_CellsChange;
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
xlApp = new Excel.Application();
xlApp.Visible = true;
object misValue = System.Reflection.Missing.Value;
xlWorkBook = xlApp.Workbooks.Add(misValue);
xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);
xlWorkSheet1 = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(2);
//---------------- data is dumped to the excel here----------------
((Microsoft.Office.Interop.Excel._Worksheet)xlWorkSheet).Activate();
xlApp.EnableEvents = true;
EventDel_CellsChange = new Excel.DocEvents_ChangeEventHandler(Worksheet_Change);
xlWorkSheet.Change += EventDel_CellsChange;
}
public static void Worksheet_Change(Excel.Range Target)
{
try
{
xlApp.EnableEvents = false;
Excel.Range range = xlWorkSheet.get_Range("Y2");
range.Formula = "=A2";
}
catch (Exception ex)
{
}
finally
{
xlApp.EnableEvents = true;
}
}
}
来源:https://stackoverflow.com/questions/16683969/excel-worksheet-change-event-is-not-firing